docs(ui): enhance mdbook docs aesthetics with custom css

[Xploit-Ghost]

This PR introduces a custom UI enhancement for the project's user-facing mdBook documentation.

Changes made:

• Added docs/theme/custom.css containing rules for modern typography (Inter fallback stack), tighter letter spacing, readability width limits, and a frosted-glass sticky menu for mobile views.
• Updated docs/book.toml to correctly load additional-css = ["theme/custom.css"].

These changes significantly improve the aesthetic quality and reading experience of the mohu docs while maintaining full compatibility with the existing build pipeline.

Resolves #267
Thank you for your time!
Please add the appropriate gssoc:approved , difficulty, type and quality labels.

Summary by CodeRabbit

Release Notes

• Documentation
  • Added examples to library documentation for improved clarity.
  • Enhanced documentation site styling with improved typography, spacing, and responsive design for better readability.

[github-actions]

PR Check Summary

Item	Value
Branch	issue-267
Changed crates	crates/mohu-buffer
Files changed	3

CI will run: build, test, clippy, fmt, cargo-deny, DCO, semver.
Reviewer assigned from CODEOWNERS.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e2900f06-54db-40e3-a673-e592a02b50e9

📥 Commits

Reviewing files that changed from the base of the PR and between ab7c667 and 91b16f2.

📒 Files selected for processing (1)

• docs/theme/custom.css

📝 Walkthrough

Walkthrough

This PR enhances project documentation through two complementary improvements: Rustdoc examples in the Layout API that demonstrate shape and stride behavior, and a custom CSS stylesheet for the mdBook site that introduces modern typography, readability constraints, styled code blocks, and a sticky navigation bar with glassmorphism for mobile screens.

Changes

Documentation Improvements

Layer / File(s)	Summary
Layout API documentation examples crates/mohu-buffer/src/layout.rs	Expands Rustdoc for Layout struct and new_c / new_f constructors with runnable examples that construct C and F-contiguous layouts and assert expected shape and stride values.
mdBook custom CSS stylesheet docs/book.toml, docs/theme/custom.css	Configures mdBook to load custom styling, then defines global typography via CSS variables, constrains content width and line height, updates heading weight and letter-spacing, rounds code block corners, and adds a sticky, blurred navigation bar with a bottom border for mobile viewports.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~4 minutes

Poem

🐰 A rabbit's verse on docs so fine:
Stride examples dance in line,
Typography takes center stage,
Rounded code blocks grace each page,
Mobile menus float with glow—
All the docs now brightly show! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The PR includes changes to crates/mohu-buffer/src/layout.rs (adding Rustdoc examples) which appears to be an unrelated change not mentioned in the linked issue #267.	The Layout API documentation changes should be separated into a different PR or the linked issues should be updated to include this documentation task.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding custom CSS to enhance mdBook documentation aesthetics.
Linked Issues check	✅ Passed	The PR implements all core objectives from issue #267: custom CSS with modern typography, reading width constraints, rounded code blocks, and sticky glassmorphism menu for mobile.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

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• Create PR with unit tests

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[Xploit-Ghost]

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/theme/custom.css`:
- Around line 2-4: The CSS root variable --fonts references 'Inter' but the font
is never loaded; update the stylesheet to load Inter by adding a font import or
`@font-face` before the :root declaration (e.g., import Inter from Google Fonts or
your CDN/self-hosted URL) so the font-family declared in :root (--fonts)
actually uses Inter at runtime; ensure the import URL matches the desired
weights/display settings and that the `@import/`@font-face appears above the :root
selector so browsers apply it.

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Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 7bce6011-7583-438e-ad2c-56b4d5bb42b4

📥 Commits

Reviewing files that changed from the base of the PR and between 0afc975 and ab7c667.

📒 Files selected for processing (3)

• crates/mohu-buffer/src/layout.rs
• docs/book.toml
• docs/theme/custom.css

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